R help - Mar 2012 - closing file with close(file) *silently*

Hi All,

I am writing a function that reads a file in

myfile = file('myfile.raw', 'rb')
.
.
.
.
.
close(myfile)

No matter what, I get the warning

Warning message:
closing unused connection 3 (myfile.raw)

Since the whole thing is in a function, I'd like to avoid unecessary noise
for the user, and I'd like to kill the warning -- without having to mess
with global options.

Any ideas how?

BW

F

 

--
Federico C. F. Calboli
Neuroepidemiology and Ageing Research
Imperial College, St. Mary's Campus
Norfolk Place, London W2 1PG

Tel +44 (0)20 75941602   Fax +44 (0)20 75943193

f.calboli [.a.t] imperial.ac.uk
f.calboli [.a.t] gmail.com

The help for warning offers some suggestions.

Sarah

On Tue, Mar 6, 2012 at 12:53 PM, Federico Calboli
<f.calboli at imperial.ac.uk> wrote:
> Hi All,
>
> I am writing a function that reads a file in
>
> myfile = file('myfile.raw', 'rb')
> .
> .
> .
> .
> .
> close(myfile)
>
> No matter what, I get the warning
>
> Warning message:
> closing unused connection 3 (myfile.raw)
>
> Since the whole thing is in a function, I'd like to avoid unecessary
noise for the user, and I'd like to kill the warning -- without having to
mess with global options.
>
> Any ideas how?
>
> BW
>
> F
>
-- 
Sarah Goslee
http://www.functionaldiversity.org

On 06/03/2012 17:53, Federico Calboli wrote:
> Hi All,
>
> I am writing a function that reads a file in
>
> myfile = file('myfile.raw', 'rb')
> .
> .
> .
> .
> .
> close(myfile)
>
> No matter what, I get the warning
>
> Warning message:
> closing unused connection 3 (myfile.raw)
>
> Since the whole thing is in a function, I'd like to avoid unecessary
noise for the user, and I'd like to kill the warning -- without having to
mess with global options.
>
> Any ideas how?
Make sure the connection (not 'file') is really closed.  That message 
indicates that close(myfile) was never called.

A good way to do this is to use on.exit() in your function.
> BW
>
> F
>
>
>
> --
> Federico C. F. Calboli
> Neuroepidemiology and Ageing Research
> Imperial College, St. Mary's Campus
> Norfolk Place, London W2 1PG
>
> Tel +44 (0)20 75941602   Fax +44 (0)20 75943193
>
> f.calboli [.a.t] imperial.ac.uk
> f.calboli [.a.t] gmail.com
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
Hmm, how long have you been asking questions here?  Following the 
posting guide is way overdue.  We should not have to guess what error 
you made in the code you failed to show us.